Cobra Exhaust Vent
Instructions, Data Sheets, Codes

Cobra^® Exhaust Vent for Roof Ridge

Effective attic ventilation is critical for a long-lasting roof!
A properly balanced attic ventilation system will help to:

Remove excess heat and moisture to protect your roof from premature deterioration
Prevent roof rot in your attic or roof deck
Minimize peeling and extend the life of exterior and interior paint
Limit the growth of harmful mold
Safeguard your attic possessions against mildew damage
Guard against ice damming in harsh winter climates
Possibly reduce excessive heating and air conditioning costs

Good Housekeeping

Cobra^® exhaust vent is a key part of the GAF-Elk Smart Choice^® Roof System Solution, and has even earned the prestigious Good Housekeeping Seal.

Homeowner’s Best Choice

Vents Your Attic…
Allows heat and condensation to escape at the most effective location — the ridge
Looks Terrific…
100% shingle-over design is virtually invisible when installed
Superior Protection…
Helps to prevent wood rot and extends the life of your
exterior paint
Safeguards Possessions…
Helps limit mildew growth caused by damp attic air
Energy Efficient…
May even reduce your energy bills!
Watertight…
Passes the 110 mph wind-driven rain test*
Safer…
Helps prevent problems with insects, birds, and animals in your attic
Peace Of Mind…
Backed by a 40-year ltd. warranty**

*Under controlled laboratory conditions

**See ltd. warranty for complete coverage and restrictions

Professional’s Best Choice

Greater Homeowner Satisfaction…
Low-profile design is hidden by ridge cap shingles
Easy To Install…
Quick, 3-step process on roof slopes between 3:12 and 20:12. No need for complicated fitting, wrapping, connectors, or end plugs

Nails Included…
Includes Smart Nails ™ for reliable hand installation or
1 3/4" coil nails for nail gun installation
Great Performance…
Provides 16.9 sq. in./linear foot (hand nail) or 14.1 sq. in./linear foot (nail gun) of net free ventilating area at the most effective location on the roof
More Reliable…
Will not crack or dent during shipping and installation; won’t corrode, rust, or turn brittle
Ridge Cap Compatible…
Works with traditional size

Texas Department of Insurance
Product Evaluation RV-19

Florida Building Code
FL197-R2

ICC-ES-ESR 1265

Balanced Ventilation Requirements

Balanced ventilation requires an equal amount of intake ventilation and exhaust ventilation. GAF-Elk recommends, at a minimum, providing 1 square foot of Net Free Ventilation for every 300 square feet of attic floor space. Consult local building codes for specific ventilation requirements in your area.

Calculate the total square footage of the attic floor area (round up to the next highest number). This number will determine the minimum total linear feet of Cobra^® exhaust vent that is needed.
Find the appropriate amount of Cobra^® exhaust vent and minimum intake ventilation that corresponds to the total attic square footage.

Based on 1/300 Rule
Total Attic Square Footage	Recommended Length of Cobra^® Exhaust Vent (Feet)*	Minimum Intake Ventilation (Net Free Area in Sq. In.)*
1600	23/28	389/395
1900	27/33	457/466
2200	32/38	541/536
2500	36/43	609/607
2800	40/48	676/677
3100	45/53	761/748
3400	49/58	829/818

*First figure pertains to Hand Nail, second figure pertains to Nail Gun.

NOTE: Always have a balanced ventilation system. In no case should the amount of exhaust ventilation at the ridge exceed the amount of soffit ventilation.